Neill



D. S. McNElLL.

DOOK, HOLDFAST, AND FOUNDATION PIN.

APPLICATION FILED OCT. 15. 1911.

1,318,680. Patented Oct. 14,1919.

shaped hollow inside.

i like enables the operation of hanging the,

cables, pipes or tubes hereafter referred to,

, cement to dry and set, as iS- the case with ordinary wood plugs or ragged or barbed {UNITED STATES PATENT; QFFICE- 7 JUIDONALD STUART McNEILL, orfetasf ow, sco'rLAn'D.

DOOK, HOLDFAST, AND FOUNDATION-PIN.

To all whom it may concern Be itknown that I, DONALD STUART 'Mc- NEILL, of 7 Ruskin Terrace Rutherglen, Glasgow, Scotland, electrical. engineer, have invented certain new anduseful Improvements in Docks, Holdfasts, and Foundation-- Pins, of which the following isa specification. I

1 My invention, which relates to improvements in dooks, holdfasts and foundation pins, has for its object to especially expedite the fixing operation, increase the efiiciency,

prolong the life and insure greater stability of the device, and its employment has special reference to electrical installation, more especially in coal and other mines and hke places,

where-the atmosphericconditions make Wood plugs useless, and cast iron or other plugsv used with cement a costly'operation' due to the time which has toelapse before the cement or fixing medium can set. Clips are used with dooks for carrying the cables, tubesor pipes, as will be hereafter referred to.

The dook comprises a cast iron casting made in one piece. The inserting end is formed with jaws ragged or serrated on the outside and a tapered mouth or Wedge- The taper end is so designed and treated durin casting as to be fractured when force is applied within the hollow. A hole-of just suflicient size is knocked in wall, floor or other masonry, and the jaw end of the ,dook simply inserted,

thereby doing away with the operation of the jaws breaking apart at the inserted end,. as already referred to, so that the farther the wedge is driven home, the wider the fractured jaws are forced apart, and consequently the firmer the grip becomes, the wedge remaining, permanently in the driven position. Thus the fixing of the dook without the aid of any medium such as cement and the to be carriedout immediately without any loss of time or the time wasted walting for bolts. The'exposed portion of the dook is formed with lugs or lateral projections. The clip used with the dook is comprised of steel Specification of Letters Patent.

and bent to size of tube or cable which. itisdesigned to carry. To fix the tube, pipe or cable, it is laid up against the face of dook and the clip sprung over the small facelugs or projections, thus fixing the tube firmly without any screws or other fixing.

. In another form, the. exterior of the dook or holdfast is formed of angular or L-for- 'niationn This type is designed to be used witlr the existing ordinary saddles, these saddles being fixed by means of screws tapped into the face of the angular or L- shape casting.

The foundatlon or holding down pin or dookis for fixingbrackets,- or castings to the wall, roofior floor. In this form, the dook 1s fixed in-th'e s'ame wayby driving home the small wedge, but the body of the dook is made square and solid. The necessary size ofho'lebeing drilled and tapped therein and Figure 1 illustrates 1n side elevation the dook or holdfast in one of its simplest forms inserted in position within the hole it is designed to occupy, carrying an exterior clip.

Fig. 2 is a perspective view of the wedge adapted to be used with the dook or holdfast.

Fig. 3 is a view corresponding to Fig. 1 of the dook or holdfast in position, the wedge havingbeen driven home and the inserted end of the jaws of the dook or holdfast fractured.

Fig. 4 is a front elevation of Fig. 3.

Fig. 5 is a similar view to Fig. 3 of an j atented Oct. 14, 1919; Application filed'october 15, 191-7., Seria-rNo. 196,714.

alternative form of the dook or holdfast (carrying an ordinary saddle) with regard to its exterior form or surface.

Fig. 6 is a front elevation of the same.

Fig. 7 isian elevation of the dook orhold: fast applied to a floor and used as a foundation pin or analogous device.

Fig. 8 is a similar view of the dook or holdfast applied to a vertical wall in the employment of a foundation pin, all hereafter more fully referred to and described.

Referring to Figs. 1 to & inclusive, A is the dook or holdfast, the inserting end thereof being formed with ragged or serwedge shape hollow designed to receive the wedge D which is shown in Fig. 3 inserted therein and driven home, the jaws broken apart and the serrated surfaces B biting into the interior of the upper and lower surfaces of the wall of the hole E to such a depth, as seen in figure referred to, as to render displacement impossible. The exterior or exposed portion A is formed with lugs or projections A A to receive the clip F whose bent end F engage or coact with the projections A A aforesaid when sprung in position, with the tube or cable G interposed and carried therebetween.

Referring to Figs. 5 and 6, the dook or holdfast A there shown differs in no respect interiorly from that already described. The exterior, however, is provided with a leg or arm H which is bent to lie snugly against the surface of the wall I, the existing saddle fitting J being attached thereto by screws J J as shown with the tube or conductor carried therein.

Referring to Figs. 7 and 8, the body of the dook or holdfast A is of square formation'and is employed as a holding down pin for fixing the bracket K, which is fixed to it by the medium of a screw boltor stud L, the exposed or exterior portion of the dook or holdfast A being tapped and threaded to receive it. The expanding of the gripping surfaces is obtained by the serrated members B being fractured or severed by the force of the driven wedge C, as'is the case in connection with the dook or holdfast, illustrated in Figs. 1 to 6 inclusive.

Claims. 7

1. A dock or holdfast comprising a body having a pair of jaws connected together at one end and spaced apart from said connected portion to the other end, said jaws having external serrated surfaces and having opposing inwardly converging inner surfaces, and said connecting portion of said body being frangible, and a wedge for in sertion between said jaws and to fracture said connecting portion and expand the jaws when said wedge is driven in place.

2. A dook or holdfast comprising a body having a pair of jaws connected together at one end and spaced apart from said c011- nected portion to the other end, said jaws having external serrated surfaces and having opposing inwardly converging inner surfaces, and said connecting portion of said body being frangible, a wedge for insertion between said jaws and to fracture said connecting portion and expand the jaws when said wedge is driven in place, and a clip having bent surfaces arranged to engage the exterior or exposed portion of said dook or holdfast.

In testimony whereof I afiix my signature in presence of two witnesses.

DONALD STUART MoNEILL. W'itnesses JOHN LIDDLE, JOHN TRAIN LIDDLE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

